JPH0720342Y2 - Inertial supercharger for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention divides a plurality of cylinders of a multi-cylinder internal combustion engine into a plurality of cylinder groups in which intake strokes do not overlap, and connects each cylinder group to each cylinder. The exhaust air of each cylinder group is independent of each turbine while the exhaust gas of each cylinder group is connected to the downstream side of each compressor of the exhaust turbocharger provided corresponding to each cylinder group. The present invention relates to the improvement of the inertia supercharging device for each cylinder internal combustion engine.

[Prior Art] As an inertial supercharging device for such a multi-cylinder internal combustion engine, a device as shown in Fig. 9 is known (actually developed model 60-4718).
Issue).

That is, it is a twin turbocharged engine having six cylinders 1 to 6, and the cylinders whose exhaust flows do not interfere with each other are collected into two groups and are driven by the exhaust pressure. Compressors 8a, 8b connected to
Is connected to the cylinder in the intake stroke. In this way, the exhaust pressure supplied to the turbine is averaged while the intake interference is prevented, and the turbine efficiency is improved. In addition, 17 is an air cleaner and 18 is a muffler.

However, in such an inertial supercharging device for a conventional multi-cylinder internal combustion engine, the collecting portions 15 and 16 of the intake passages 9 to 11 and 12 to 14 connected to the cylinders 1 to 6 are provided for each cylinder group. Since it is connected to the downstream side of the compressor 8a, 8b of the turbocharger, even if the negative pressure wave generated in the intake stroke propagates in the intake passage, the compressor 8a, 8b acts as a throttle and absorbs this negative pressure wave. Therefore, the reflected waves do not propagate to the cylinders 1 to 6. Therefore, in such a conventional inertial supercharging device, there arises a problem that the supercharging cannot be effectively performed by utilizing the inertial effect and the pulsating effect.

Therefore, the applicant of the present invention has proposed, in Japanese Patent Application No. 62-33867, a device in which the collecting portion is connected by a resonance tube. This will be described with reference to FIG. 10 by attaching the same symbols to the portions corresponding to FIG.

The intake passage 30 of the engine is connected via an air cleaner 17 to compressors 33 and 34 of two exhaust turbochargers 31 and 32, respectively. The intake passages 35, 36 on the downstream side of the compressors 33, 34 are independently connected to the intake manifolds 37, 38 as a collecting portion of the supply passages provided for each cylinder group divided so that the intake strokes do not overlap. Has been done. Exhaust manifolds 39, 40 are connected to each cylinder group, and each exhaust manifold 39, 40 is connected to the compressor 3
It is independently connected to turbines 41 and 42 connected to 3,34. An exhaust passage 43 in which the muffler 18 is interposed is connected to the downstream side of the turbines 41, 42.

Further, the air supply manifolds 37, 38 are connected to each other by a resonance pipe 44.

As shown in FIG. 11, in the vicinity of the resonance rotational speed a, as shown in FIG. 11, for a normal engine that does not perform inertial intake, the volume efficiency ην
Is greatly improved and the inertial effect is improved. But the first
As shown in Fig. 12 and Fig. 13, the pumping loss is small in the high speed range and the fuel consumption is good, but the pumping loss increases in the low speed region near the resonance speed a, which deteriorates the fuel consumption (shaded line in Fig. 13). Region), the inertia effect is not exerted over the entire rotation speed.

Further, Japanese Utility Model Laid-Open No. 61-43941 and Japanese Utility Model Laid-Open No. 56-105626 disclose inertial supercharging technology using a resonance tube.
However, since the two resonance tubes are separately piped in such a known technique, a problem arises in piping in a narrow engine room.

[Problem to be Solved by the Invention] Therefore, an object of the present invention is to provide an inertial supercharging device for an internal combustion engine which does not take up space in piping.

[Means for Solving the Problems] According to the present invention, a plurality of cylinders of a multi-cylinder internal combustion engine are divided into a plurality of cylinder groups in which intake strokes do not overlap and each cylinder group is connected to each cylinder. Forming a collecting part that collects passages, connecting each collecting part to the downstream side of each compressor of the exhaust turbocharger provided corresponding to each cylinder group, while guiding the exhaust gas of each cylinder group to each turbine independently. In an inertial supercharger for a multi-cylinder internal combustion engine, a collective portion of each cylinder group is communicated with a resonance pipe whose entire length is divided by a partition plate to form two resonance passages, and the engine is provided in one of the two resonance passages. With a valve that opens and closes depending on the operating condition,
A control unit for controlling the opening and closing of the valve based on the rotation speed and load of the internal combustion engine is provided.

[Description of Action and Effect] Therefore, at low rotation speed, the valve closes the signal from the control device to reduce the volume of the resonance tube and improve the volumetric efficiency.
Further, the controller opens the valve at the time of high rotation to improve the volumetric efficiency. In this way, the fuel efficiency at low speed is improved.

Moreover, since the resonance tube is partitioned, space is saved in terms of piping and piping becomes easy.

As described above, according to the present invention, it is particularly effective at a partial load at low rotation speed.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the intake manifolds 37, 38 shown in FIG. 10 are communicated with each other by a resonance pipe 45, and the resonance pipe 45 has a partition plate 46 extending over its entire length to create a resonance having two semicircular cross sections. Passages 45a and 45b are defined, and a butterfly valve 47 is provided in a portion of one resonance passage 45a near the air supply manifold 37.

In FIG. 3, a stepping motor 48 is attached to the butterfly valve 47, and the resonance passage 45a is opened (FIG. 4) and closed (FIG. 5) by the rotation of the stepping motor 48.
It is supposed to do. The stepping motor 48 is connected to a control unit 51, and an engine rotation sensor 49 and a rack position sensor 50 that detects a load are connected to the control unit 51.

Next, the operation will be described.

It is understood that when the valve 47 is opened, the characteristic B shown in FIGS. 6 to 8 corresponding to the characteristic B1 of the resonance rotational speed a shown in FIGS. 11 to 13 is obtained. Therefore,
In the shaded area shown in FIG. 8, the fuel consumption is worse than that of an ordinary engine (characteristic A).

Therefore, based on the signal from the engine rotation sensor 49, the rotation speed a
At the control unit 51, the valve 47 is controlled to be closed. As a result, one of the resonance passages 45a is cut off, the volume of the resonance tube 45 is halved, the resonance rotational speed moves from a to b on the low speed side, and the characteristic C is obtained. Therefore, as shown by the characteristic C in FIGS. 7 and 8, the pumping loss becomes small,
Fuel consumption is improved.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(I) Since the resonance tube is partitioned, space is saved and piping becomes easy.

(Ii) Fuel efficiency is improved under partial load at low speed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line I--I of FIG. 1, FIG. 3 is a configuration diagram around a butterfly valve, FIGS. 4 and 5. The figure is a sectional view taken along the line II-II of FIG. 3, showing the butterfly valve when opened and closed.
Figures 7, 7 and 8 are volume efficiency / rotational speed characteristic charts, pumping loss / rotational speed characteristic charts and fuel consumption / cylinder injection quantity characteristic charts, respectively, and Figures 9 and 10 are different from each other. Overall configuration diagram showing a conventional device, FIG. 11, FIG.
FIGS. 13 and 14 respectively explain the effect of FIG.
9 is a drawing corresponding to characteristics A and B in FIGS. 7 and 8. FIG. 31,32 …… Exhaust turbocharger, 33,34 …… Compressor, 35,36 …… Intake passage, 37,38 …… Supply manifold, 4
1,42 …… Turbine, 45 …… Resonance tube, 45a, 45b …… Resonance passage, 46 …… Partition plate, 47 …… Butterfly valve, 48 …… Stepping motor, 49 …… Engine rotation sensor, 50 …… Rack Position sensor, 51 ... Control unit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F02B 37/16 (72) Inventor Mitsuru Tsuzuki 1-chome, Ageo-shi, Saitama Nissan Diesel Industrial Co., Ltd. In-house (72) Inventor Akira Nakamura 1-1, Oji, Ageo-shi, Saitama Nissan Diesel Industry Co., Ltd. (56) Bibliography SHO 56-105626 (JP, U) SHO 61-43941 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A plurality of cylinders of a multi-cylinder internal combustion engine are divided into a plurality of cylinder groups whose intake strokes do not overlap,
Each cylinder group is formed with a collecting portion that collects the intake passages connected to each cylinder, and each collecting portion is connected to the downstream side of each compressor of the exhaust turbocharger provided corresponding to each cylinder group. In an inertial supercharger for a multi-cylinder internal combustion engine in which the exhaust gas of each group is independently guided to each turbine, the collective portions of each cylinder group are connected by a resonance tube whose entire length is divided by partition plates to form two resonance passages. However, a valve that is opened and closed depending on the engine operating state is provided in one of the two resonance passages, and a control unit that controls the opening and closing of the valve based on the rotational speed and load of the internal combustion engine is provided. Inertial supercharger for internal combustion engine.